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Shock and Vibration
Volume 2016, Article ID 8743016, 13 pages
http://dx.doi.org/10.1155/2016/8743016
Research Article

Dynamic Characteristics of the Herringbone Groove Gas Journal Bearings: Numerical Simulations

Bin Wang,1,2 Yongtao Sun,1,2,3,4 and Qian Ding1,2

1Department of Mechanics, Tianjin University, Tianjin 300072, China
2Tianjin Key Laboratory of Nonlinear Dynamics and Control, Tianjin 300072, China
3State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, China
4State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China

Received 4 July 2016; Revised 17 October 2016; Accepted 15 November 2016

Academic Editor: Emiliano Mucchi

Copyright © 2016 Bin Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Dynamic characteristics of the herringbone grooved gas journal bearings (HGGJB) under fluid-structure interactions are systematically investigated using the finite element method. Stability and bearing capacity of the HGGJB are estimated and compared with those of the plain gas journal bearings (PGJB). Influences of the structural parameters, including the spiral angle, the groove number, the groove depth, the pressure relief hole diameter, the bearing radial clearance, the length to diameter ratio, and the rotating speed, on dynamic characteristics of HGGJB are analyzed. To verify the numerical simulation results, pressure nephograms and cross-section pressure curves of the same rotor model, calculated by the numerical simulation and the theoretical method, respectively, are compared. Similar results are obtained. Compared to the common constrained boundary conditions in the previous numerical simulations, boundary conditions adopted in this paper are complete self-absorption and the change of the gas inlet and outlet depends on the rotating state of the rotor, which are more accordant with the real dynamic characteristics of the HGGJB. In all, the results presented in this paper provide a deeper and better understanding of the dynamic characteristics of the HGGJB under fluid-structure interactions.